<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>商品分类</el-breadcrumb-item>
		</el-breadcrumb>
		<!-- 卡片视图区域 -->
		<el-card>
			<el-row>
				<el-col>
					<el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
				</el-col>
			</el-row>
			<!-- 表格 -->
			<tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false"
			 show-index index-text="#" border :show-row-hover="false">
				<!-- 是否有效 -->
				<template slot="isok" slot-scope="scope">
					<i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color: lightgreen;"></i>
					<i class="el-icon-error" v-else style="color: red;"></i>
				</template>
				<!-- 排序 -->
				<template slot="order" slot-scope="scope">
					<el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
					<el-tag type="success" size="mini" v-if="scope.row.cat_level===1">二级</el-tag>
					<el-tag type="warning" size="mini" v-if="scope.row.cat_level===2">三级</el-tag>
				</template>
				<!-- 操作 -->
				<template slot="opt" slot-scope="scope">
					<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
					<el-button type="danger" icon="el-icon-delete" size="mini" @click="removedCateById(scope.row.cat_id)">删除</el-button>
				</template>
			</tree-table>
			<!-- 分页区域 -->
			<el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="querInfo.pagenum"
			 :page-sizes="[3, 5, 10, 15]" :page-size="querInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
			</el-pagination>
		</el-card>
		<!-- 添加分类的对话框 -->
		<el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
			<!-- 添加分类的表单 -->
			<el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
				<el-form-item label="分类名称" prop="cat_name">
					<el-input v-model="addCateForm.cat_name"></el-input>
				</el-form-item>
				<el-form-item label="父级分类">
					<!-- options用来指定数据源 -->
					<!-- props用来指定配置对象 -->
					<el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys"
					 @change="parentCateChanged" clearable change-on-select>
					</el-cascader>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addCateDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addCate">确 定</el-button>
			</span>
		</el-dialog>
		<!-- 编辑对话框区域 -->

		<el-dialog title="编辑分类" :visible.sync="editCateDialog" width="50%">

			<el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="100px" class="demo-ruleForm">

				<el-form-item label="分类名称:" prop="cat_name">

					<el-input v-model="editCateForm.cat_name"></el-input>

				</el-form-item>

			</el-form>

			<span slot="footer" class="dialog-footer">

				<el-button @click="editCateDialog = false">取 消</el-button>

				<el-button type="primary" @click="editCate">确 定</el-button>

			</span>

		</el-dialog>
		<!-- 删除对话框区域 -->

		<el-dialog title="删除分类" :visible.sync="deletedCateDialogVisible" width="50%">

			<span>这是一段信息</span>

			<span slot="footer" class="dialog-footer">

				<el-button @click="deletedCateDialogVisible = false">取 消</el-button>

				<el-button type="primary" @click="deletedCateDialogVisible = false">确 定</el-button>

			</span>

		</el-dialog>

	</div>
</template>

<script>
	export default {
		data() {
			return {
				//查询条件
				querInfo: {
					type: 3,
					pagenum: 1,
					pagesize: 5
				},
				//商品分类的数据列表，默认为空
				catelist: [],
				//总数据条数
				total: 0,
				//为table指定列的定义
				columns: [{
						label: '分类名称',
						prop: 'cat_name'
					},
					{
						label: '是否有效',
						//表示，将当前列定义为模板列
						type: 'template',
						//表示当前这一列使用的模板名称
						template: 'isok'
					},
					{
						label: '排序',
						//表示，将当前列定义为模板列
						type: 'template',
						//表示当前这一列使用的模板名称
						template: 'order'
					},
					{
						label: '操作',
						//表示，将当前列定义为模板列
						type: 'template',
						//表示当前这一列使用的模板名称
						template: 'opt'
					}
				],
				//控制添加分类对话框的显示与隐藏
				addCateDialogVisible: false,
				//添加分类的表单数据对象
				addCateForm: {
					//将要添加的分类的名称
					cat_name: '',
					//父级分类的Id
					cat_pid: 0,
					//分类的等级，默认要添加的是1级分类
					cat_level: 0
				},
				addCateFormRules: {
					//添加分类表单的验证规则对象
					cat_name: [{
						required: true,
						message: '请输入分类名称',
						trigger: 'blur'
					}, ]
				},
				//父级分类的列表
				parentCateList: [],
				//指定级联选择器的配置对象
				cascaderProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				//选中的父级分类的Id数组
				selectedKeys: [],
				editCateDialog: false,

				editCateForm: {

					cat_name: '',

					cat_id: 0

				},

				editCateFormRules: {

					cat_name: [

						{
							required: true,
							message: '请输入分类名称',
							trigger: 'blur'
						}

					]

				},

				deletedCateDialogVisible: false
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			//获取商品分类数据
			async getCateList() {
				const {
					data: res
				} = await this.$http.get('categories', {
					params: this.querInfo
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品分类失败！')
				}
				console.log(res.data)
				//把数据列表，赋值给catelist
				this.catelist = res.data.result
				//为总数据条数赋值
				this.total = res.data.total
			},
			//监听pagesize改变
			handleSizeChange(newSize) {
				this.querInfo.pagesize = newSize
				this.getCateList()
			},
			//监听pagenum改变
			handleCurrentChange(newPage) {
				this.querInfo.pagenum = newPage
				this.getCateList()
			},
			//点击按钮，展示添加分类的对话框
			showAddCateDialog() {
				//先获取父级分类的数据列表
				this.getParentCateList()
				//再展示出对话框
				this.addCateDialogVisible = true
			},
			//获取父级分类的数据列表
			async getParentCateList() {
				const {
					data: res
				} = await this.$http.get('categories', {
					params: {
						type: 2
					}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取父级分类数据失败!')
				}
				console.log(res.data)
				this.parentCateList = res.data
			},
			//选择项发生变化触发这个函数
			parentCateChanged() {
				console.log(this.selectedKeys)
				//如果selectedKeys数组中的length大于0，证明选中的父级分类
				//反之，就说明没有选中任何父级分类
				if (this.selectedKeys.length > 0) {
					//父级分类的Id
					this.addCateForm.cat_pid = this.selectedKeys[
						this.selectedKeys.length - 1
					]
					//为当前分类的等级赋值
					this.addCateForm.cat_level = this.selectedKeys.length
					return
				} else {
					//父级分类的Id
					this.addCateForm.cat_pid = 0
					//为当前分类的等级赋值
					this.addCateForm.cat_level = 0
				}
			},
			//点击按钮，添加新的分类
			addCate() {
				this.$refs.addCateFormRef.validate(async valid => {
					if (!valid) return
					const {
						data: res
					} = await this.$http.post('categories', this.addCateForm)
					if (res.meta.status !== 201) {
						return this.$message.error('添加分类失败!')
					}
					this.$message.success('添加分类成功！')
					this.getCateList()
					this.addCateDialogVisible = false
				})
			},
			//监听对话框的关闭事件，重置表单数据
			addCateDialogClosed() {
				this.$refs.addCateFormRef.resetFields()
				this.selectedKeys = []
				this.addCateForm.cat_level = 0
				this.addCateForm.cat_pid = 0
			},
			async showEditCateDialog(cat_id) {

				const {
					data: res
				} = await

				this.$http.get('categories/' + cat_id)

				//console.log(res)

				if (res.meta.status !== 200) {

					return this.$message.error('查询分类失败！')

				}

				this.editCateForm = res.data

				this.editCateDialog = true

			},

			editCate() {

				this.$refs.editCateFormRef.validate(async valid => {

					//console.log(valid)

					if (!valid) return

					const {
						data: res
					} = await this.$http.put('categories/' + this.editCateForm.cat_id,

						{
							cat_name: this.editCateForm.cat_name
						})

					if (res.meta.status !== 200) {

						return this.$message.error('修改分类失败！')

					}

					this.editCateDialog = false

					this.getCateList()

					//this.$message.success('修改分类成功')

				})

			},

			async removedCateById(id) {

				const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {

					confirmButtonText: '确定',

					cancelButtonText: '取消',

					type: 'warning'

				}).catch(err => err)

				if (confirmResult !== 'confirm') {

					return this.$message.info('取消了删除')

				}

				const {
					data: res
				} = await

				this.$http.delete('categories/' + id)

				if (res.meta.status !== 200) {

					return this.$message.error('删除分类失败！')

				}

				//this.$message.success('删除成功')

				this.getCateList()

			}
		}
	}
</script>

<style Lang="less" scoped>
	.treeTable {
		margin-top: 15px;
	}

	.el-cascader {
		width: 100%;
	}
</style>
